A18.31 Tuberculous peritonitis

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Tuberculous ascites

MS-DRG index

Defines the logic of DRG(s) 371-373 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 014.00 Tuberculous peritonitis, unspecified (approximate)

Code annotations containing back-references to A18.31

Back-references to A18.31

• Type 1 Excludes: K65 Peritonitis ("peritonitis in tuberculosis (A18.31)")
• Type 1 Excludes: K67 Disorders of peritoneum in infectious diseases classified elsewhere ("peritonitis in tuberculosis (A18.31)")

Back-references to A18

• Type 2 Excludes: A31 Infection due to other mycobacteria ("tuberculosis (A15-A19)")

Diagnosis Index entries for A18.31

• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › peritoneum, peritoneal (perforated) (ruptured) › tuberculous
• Ascites (abdominal) › tuberculous
• Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) › fibrocaseous (tuberculous)
• Peritonitis (adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion) › tuberculous
• Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) › abscess (respiratory) › subdiaphragmatic
• Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) › ascites
• Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) › omentum
• Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) › peritoneum NEC
• Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) › peritonitis

Nearby codes

• A18.16 Tuberculosis of cervix
• A18.17 Tuberculous female pelvic inflammatory disease
• A18.18 Tuberculosis of other female genital organs
• A18.2 Tuberculous peripheral lymphadenopathy
• A18.3 Tuberculosis of intestines, peritoneum and mesenteric glands
• A18.31 Tuberculous peritonitis (this code)
• A18.32 Tuberculous enteritis
• A18.39 Retroperitoneal tuberculosis
• A18.4 Tuberculosis of skin and subcutaneous tissue
• A18.5 Tuberculosis of eye
• A18.50 Tuberculosis of eye, unspecified